Screen



Feb. 3, 1942.l R. MowBRAY SCREEN v Filed Jan. 31, 1959 III,

ATTORNEYS Patented Feb. 3, 1942 SCREEN Robert E. Lee Mowbray, Cambridge,Md., assigner to The Cambridge Wire Cloth Company, Cambridge, Md., acorporation of Maryland Application January 31, 1939, Serialv No.253,910

Claims.

My invention relates to shaker screens and the like, and has among itsobjects and advantages the provision of improved binding means-securedto certain margins of the Wire mesh and fashioned for connection withtensioning means.

Shaker screens and various other types of screens employed formechanical separation purposes are provided with binding means whichusually extend along two margins of the wire cloth. Such binding meansusually includes a hook-like formation for connection with an angle orother frame means for imparting the necessary tautness to the wirecloth. `Such binding means usually comprises `plate elements located onopposite faces of the enclosed screen margin with the parts secured intoa unitary structure by spot welding. Cushioning strips are posiare madesecure by being clamped against thel wire mesh when the plate elementsand the mesh margin are welded into connected relation. In many casesthe plate elements are fashioned from sheet metal bent back upon itselfto provide the elements between which the margin of the screen ispositioned. Two individual plates have also been employed. In all casesthe plate elements and the screen margin are secured into a unitarystructure and subsequently 4bent as a unit to provide a hook forconnection with the tensioning frame.

In bending the binding and the screen itself to hook formationencounters many limitations, such as allowable thickness of the plateelements making up the binding, weight or thickness of the enclosedscreen, and the impossibility of bending such a combination of plateelements and screen to the predetermined and exact fitting measurementsessential to long screen life. Diniculties encountered in connectionwith conventional methods of fabricating screen bindings have been foundto be responsible for much screen failure. Screen life can be assuredonly through a perfect fit between the hook and the tensioning memberassociated therewith, as Well as an intact and undisturbed weld jobbetween the plate elements and the screen margin. Bending of the bindingto hook formation frequently disrupts welded connections and causesrelative displacement of the plate elements in such degree as to impairthe wire cloth. In addition, it is essential that the offset margins ofthe plate elements maintain parallel relation with thescreen cloth sovas to effectively hold the cushioning strips in pressure relation withthe enclosed screen margin. The resulting wedgeshaped opening betweenthe offset margins 'of the plate elements permits entrance of foreignmaterials and greatly acceleratesA the impairment and destruction of thescreen cloth.

Accordingly, an object of my invention is to provide a screen of thetype described embodying a binding means for the margins of the wiremesh, which binding means comprises at least two plates between whichthe margin of the wire mesh is effectively clamped through welding ofthe parts into a unitary structure, with the plates preformed to haveexact intertting relation to provide a hook for connection with atensioning member. The plates are also preformed to provide offsetmargins 'between which and the wire mesh I position cushion strips,which are related in such manner as to provide two'offset general linesof bend in the wire mesh adjacent the binding means.

Another object 'is to provide a screen of the type described hin whichthe wire mesh is maintained under tension through the medium of anadjustable frame, wherein the wire mesh is provided with binding meansalong certain margins made up of plates preformed to provide hookformations for connection with the frame and in which said margins ofthe wire mesh are located between the plates and the parts welded into aunitary structure. l

A further object is to provide a screen of the type described in whichthe margins of the wire mesh are effectively clamped between twometallic plates with at leas-t one of the plates bent to provide ahookfor connection` with a supporting and tensioning frame and in which theparts are preformed, assembled and subsequently welded into a unitarystructure with the margin of the wire mesh secured between the plateelements.

A further object is to provide a novel method.

of fabricating al screen marginal binding so as -to effectively anchorthe margin to the binding,

heavier gauge metal than is used in commonk practice. The thickness orweight of the screen is not limited as itis separately bent to shape toconform to the definite preformed contours of the plates.

In the accompanying drawing:

Figure l is a plan view of a screen embodying my invention;

Figure 2 is an enlarged sectional perspective view of one of thetensioning members illustrating the manner in which-the margins of thewire mesh are made secure;

Figure 3 is a perspective view of the structure illustrated in Figure 2with the parts separated for the purpose of illustration;

Figure 4 is a view similar to Figure 2 illustrating a modilcation;

Figure 5 is a view similar to Figure 4 but illustrating a furthermodification; and

Figure 6 is a view similar to Figure 5 but illustrating a furthermodified form of fastening means.

In the embodiment selected to illustrate my invention, I make use of ascreen supporting and tensioning frame I8, which includes side membersI2 and end members I4 each of which may comprise angles. Both sidemembers I2 are provided with threaded sockets I6 for connection withrods I8 oppositely threaded at their ends so that the side members I2may be adjusted toward and away from each other through rotation of therods. Both end members I4 are so related to the side members I2 as topermit relative shifting of the side members. Figure 2 illustrates oneof the side members I2 in cross section, which member has its flange 26lying in a horizontal plane and the flange 22 lying in a vertical plane,the latter flange serving as a mount for the sockets I6 associated withthat side of the frame.

The wire mesh 24 of Figure 1 is mounted on the frame I0 and ismaintained under tension through the medium of the tension rods I8. Eachside margin of the screen 24 is fastened throughout its entire length tobinding means 25 which has hooked connection with one of the sidemembers I2. Figure 2 illustrates one of the binding means in crosssection in combination with one of the frame members I 2. According toFigures 2 and 3, I make use vof two preformed metallic plates 26 and 28which are located on opposite sides of the margin 38 of the Wire mesh24.

Plate 26 is bent at 32 to provide a right-angular ilange 34 bent at 36to-provide a flange 38 arranged at an acute angle to the area 48 of theplate 26. Plate 28 is bent at 42 to provide a flange 44 paralleling theflange 34. Flange 44 is bent at 46 to provide a flange 48 arranged at anangle to the area 58 of the plate 28 corresponding to the angularitybetween the ilange 38 and the area 48 of the plate 26. I bend the flange48 back upon itself at 52 to provideva hook 54 within which the outermargin of the flange 38 is positioned when the two plates are assembled,see Figure 2. p

The area 46 of the plate 26 is offset outwardly 58, as at 68 and 10,respectively, see Figure 2. Between the portion 68 and the margin 30 Iinterpose a cushion 12 which may comprise a rubber strip. A cushion 14is interposed between the portion 'I0 of the wire mesh 66 and the margin38, which cushion may also comprise a rubber strip. Referring to Figure2, it will be noted that the cushion 'I2 extends beyond the edge 16 ofthe offset flange 56 and that the cushion 'I4 extends beyond the edge 18of the offset llange 58.

Figure 3 illustrates the parts of Figure 2 preparatory to assembling theparts into a unitary structure. The cushion 'I2 is stapled at 8U to themesh 64 at suitable intervals for holding the parts in assembledrelation and true alignment. Cushion 14 is stapled at 82 to the mesh 66at suitable intervals for connecting the parts in asn sembled relationand proper alignment. Mesh 66 to provide a flange 56 which parallelstherarea 40.

Similarly, the area 50 of the plate 28 is offset outwardly to provide aflange 58 which parallels the area 58. Margin 38 of the wire mesh 24 ispreformed to provide a run 60 located between the flanges 34 and 44 anda run 62 located between the flanges 38 and 48, with the edge of the run62 lying close to the bight of the hook 52. Between the areas 48 and 58and the margin 30 I position strips of wire mesh 64 and 66, each ofwhich has one edge terminating at the flange 34.

partly underneath their respective ilanges 56 and is then placed inposition on the area 50 with the cushion 'I4 lying upon the flange 58.Mesh 24 is then positioned with its margin 30 lying on the mesh 66 andits runs 68 and 62 embracing the flanges 44 and 48 of the plate 28. Mesh64 is assembled with the plate 2'6 with the cushion I2 lying underneaththe flange 56, after which the plate 26 is placed in position with itsflanges 34 and 38 embracing the runs 60 and 62 of the margin 38. Plate26 is then adjusted to position and all the parts are connected into aunitary structure by spot Welding 84 at suitable intervals. The runs 68and 62 of the margin 30 are pressed between the flanges 34 and 38 of theplate 26 and the flanges 44 and 48 of the plate 28. The margin 30 istightly clamped between the two strips of mesh 64 and 66 throughout itsentire length so as to be securely fastened. Wires B6 of the mesh 24 arearranged at right angles to the side members I2. These wires are placedunder tension through adjustment of the rods I8 and the screen unit iseffectively connected with the side members through tensioning of themesh 24. Figure 2 illustrates the area 58 and the flanges 44 and 48 asdefining a hook 88 which hooks over the flange 20 of the frame memberI2. Adjustment of the rods I8 will press the edges of the flanges 20against the bights of the hooks 88 so as to effectively secure the mesh24 to the frame members I2.

In operation, the screen is vibrated in the usual manner, which causesthe mesh 24 to bend along.

lines vclosely adjacent the side members I2. Figure 2 illustrates thecushions 'l2 and 14 as extending beyond the flanges 56 and 58 so as toprotect the mesh 24 from direct engagement with the flanges. Cushions 12and 14 are pressed gently between the flanges 56 and' 58 and thecushions are of such widths as to have cushioning relation with aconsiderable area of the mesh 24. Bending the mesh 24 downwardly, whenviewing Figure 2, will locate the line of bend along the edge 'I8 of thellange 58 with the projecting margin of the cushion bending along theline of the edge 18. However, cushion 'I2 is of such thickness andresiliency as to yield effectively to any bending action of the mesh 24so that the latter will bend gently throughout an arc of considerablelength. Similarly, bending the mesh 24 upwardlywill flex the cushion 'I2upwardly about the edge 16, with the general line of bend located to oneside of the line of bend determined by the flange 58. Thus the mesh 24will bend generally along two spaced lines so that the bending actionimparted to the mesh is distributed Lthroughout a larger area of themesh along two general lines, thus prolonging the life of the mesh.

The two strips of mesh 64 and 66 constitute effective binder means whenclamped between the plates 26 and 28 so that the margin 30 iseffectively secured throughout the entire overlapping areas of theplates 26 and 28. Cushions 12 and 14 eliminate all metallic contactbetween the flanges 56 and 58 so that any bending action imparted to themesh 24 is localized within and about the cushions 12 and 14. In View ofthe effective anchorage of the margins 30, the mesh 24 may be placedunder any necessary tension without any danger of rupturing the mesh orimpairing its anchored margins.

In assembling the parts of Figure 3, the mesh strips 64 and 66 may bespot welded at 90 to their respective areas 40 and 50 to facilitateassembly of the parts. After assembly, the parts will be spot welded asindicated at 84 in Figure 2.

In my invention, margin 30 issecurely fastened while the cushioningmeans is located between the rm anchorage for the margin and the body ofthe mesh 24. The cushioning means are of such width as to cushion theflexing area of the mesh 24 between the plates 26 and 28 so that bendingof the mesh occurs in advance of the fixed connection between the meshand the plates.

A11 the parts of Figure 3 are preformed in every detail before assemblyso that the parts will have close and exact interfitting relation. Themargins of the wire cloth are effectively secured through spot weldingof the parts, and the screen is anchored in the binding means in suchmanner as to be uniformly tensioned throughout its full length.Preforming of all the parts permits much heavier sheet material to beutilized and no difficulty is experienced in forming heavy wire cloth.Flanges 56 and 58 are preformed to have true parallel relation so as tomaintain the cushioning strips 12 and 14 in effective pressure relationwith the wire mesh so as to insure uniform cushioning for the screen inaddition to maintaining a sealed condition which prevents the entranceof foreign material.

Figure 4 illustrates a construction identical with that illustrated inFigure 2 with the exception that the flange 92 corresponding to theflange 48 terminates at 94 flush with the edge 96 of the flange 98corresponding to the flange 38. ll the parts of Figure 4 are preformed.Figure 5 illustrates plates and |02 of widths slightly greater than theflange |04 of the angle |06 corresponding to the angle 22. Plate |02 isflanged upwardly at |08 to terminate flush with the upper face of theplate |00. In other rpects the mesh 24 is clamped between the plates |00and |02 in the same manner as illustrated in Figure 2, and the parts arepreformed to shape. These plates are spot welded at suitable intervalsI0, and the plates, together with the screen wire therebetween, areprovided with openings |I2 at suitable intervals for the reception ofbolts ||4 which extend through openings in the flange |04 for boltingthe mesh to the angle. In Figure 4, the mesh is connected with the anglethrough a hooked connection in the manner of Figure 2.

In Figure 6, the plate ||6 is provided with a hook ||8 corresponding tothe hook on the plate 28. The plate |20 is bent to provide a downwardlyextending flange |22 partly overlapping the hook H8. The mesh 24 ispositioned between the plates ||6 and |20 and the margin of the screenis anchored through spot welding |24. Plates ||6 and |20 have theiredges |26 and |28, respectively, offset in the same manner as the edges16 and 18 of Figure 2. All the forms anchor the mesh 24 in such manneras to provide offset lines of bend for the mesh.

Without; further elaboration, the foregoing will so fully illustrate myinvention that others may, by applying current knowledge, readily adaptthe same for use under various conditions of service.

I claim:

1. Screen fastening means comprising metal plates fitting a margin of awire screen, said metal plates being disposed on opposite sides of saidmargin and having contacting engagement therewith, said metal plates andsaid margin being spot welded into a unitary structure, said metalplates having offset margins, and cushioning means between said offsetmargins and said screen adjacent the screening area thereof.

2. Screen fastening means comprising metal plates fitting a margin of awire screen, said metal plates being disposed on opposite sides of saidmargin and having contacting engagement therewith, said metal plates andsaid margin being spot welded into a unitary structure, said metalplates having offset margins, and cushioning means between said offsetmargins and said screen adjacent the screening area thereof, at leastone of said metal plates being fashioned to provide a tensioning hook.

3. Screen fastening means comprising metal plates fitting in contactingengagement with the opposite sides of a correspondingly shaped margin ofa wire screen, at least one of said metal plates being fashioned toprovide a tensioning hook, said metal plates and said margin beingwelded into a unitary structure, said metal plates having offset flangesadjacent the screening area of said screen, and cushioning means betweensaid offset flanges and said wire screen, said offset flanges on oneside of the screen being relatively offset from the flanges on the otherside of the screen in the plane of said screening area to provide twogeneral lines of bend for the wire 4. The combination of a screeningmesh, plates on opposite sides of a margin of thel screening mesh, saidplates fitting said margin and arranged in contacting engagementtherewith, means for clamping said margin between said plates, saidplates having margins spaced from said screen adjacent the screeningarea thereof, cushioning means interposed between said lastmentionedmargins and said screen, a frame member, and means cooperable on saidplates and said frame member for fixedly relating the same.

5. The combination of a wire mesh having a margin of channel-shapedconfiguration, metal plates of channel-shaped configuration disposed onopposite sides of said margin, one of said plates having achannel-shaped formation to receive a margin of the other plate, saidplates and said margin of the screen being welded into a unitarystructure, said plates having flanges offset from said wire meshadjacent the screening area thereof, and cushioning elements positionedbetween said flanges and the wire mesh, said anges being relativelyoffset in the plane of said screening area to provide two general linesof bend for the wire mesh.

ROBERT E. LEE MOWBRAY.

